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13 4 x. 6х +13 = х. -Х+11=4х-13. 4х-13/12=3/12. (Х+12 7/13)-4 9/13=12 5/13.
6х +13 = х. -Х+11=4х-13. 4х-13/12=3/12. (Х+12 7/13)-4 9/13=12 5/13.

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